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Liquid crystal display

a liquid crystal display and display technology, applied in the field of liquid crystal display technology, can solve the problems of preventing the achievement of high contrast ratio and wide viewing angle, and still has not achieved a response speed comparabl

Inactive Publication Date: 2010-04-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]According to a first aspect of the present invention, there is provided a liquid crystal display comprising a liquid crystal layer causing a selective reflection and exhibiting Kerr effect, first and second electrodes applying voltage to the liquid crystal layer, a first circular polarizer disposed between the liquid crystal layer and a viewer and allowing a first circularly polarized light incident on the liquid crystal layer when irradiated with a natural light, the first circularly polarized light having an electric-field vector rotating in a direction reverse to a rotation direction of an electric-field vector of a circularly polarized light selectively reflected by the liquid crystal layer, and a second circular polarizer facing the first circular polarizer with the liquid crystal layer interposed therebetween and allowing a second circularly polarized light incident on the liquid crystal layer when irradiated with a natural light.
[0011]According to a second aspect of the present invention, there is provided a liquid crystal display comprising a liquid crystal layer causing a selective reflection and exhibiting Kerr effect, first and second electrodes applying voltage to the liquid crystal layer, a first circular polarizer facing the liquid crystal layer and allowing a first circularly polarized light incident on the liquid crystal layer when irradiated with a natural light, the first circularly polarized light having an electric-field vector rotating in a direction reverse to a rotation direction of an electric-field vector of a circularly polarized light selectively reflected by the liquid crystal layer, a second circular polarizer facing the first circular polarizer with the liquid crystal layer interposed therebetween and allowing a second circularly polarized light incident on the liquid crystal layer when irradiated with a natural light, and a backlight illuminating the liquid crystal layer through the second circular polarizer.

Problems solved by technology

Even such a liquid crystal display, however, still has not achieved a response speed comparable to that of a cathode-ray tube (CRT) display.
In addition, this coloring hinders achieving a high contrast ratio and a wide viewing angle.

Method used

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Examples

Experimental program
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Effect test

example 1

[0138]In this example, the liquid crystal display described with reference to FIGS. 1 to 3 was manufactured by the following method.

[0139]In the manufacture of the array substrate 10, the scanning lines 101a and the auxiliary capacitor lines 101b were first formed on a glass substrate 100. Chromium was used as the material of the scanning lines 101a and the auxiliary capacitor lines.

[0140]Then, the scanning lines 101a, the auxiliary capacitor lines and the glass substrate 100 were covered with the insulating film 102 made of silicon oxide. An amorphous silicon film was formed on the insulating film 102 and patterned into the semiconductor layers 103. After that, a channel protection layer (not shown) made of silicon nitride was formed on a part of each semiconductor layer 103, and ohmic layers (not shown) were formed on the semiconductor layers 103 and channel protection layers.

[0141]On the insulating film 102, the signal lines 105a, the source electrodes 105b and the power supply l...

example 2

[0152]In this example, the structure described with reference to FIG. 7 was employed in the counter electrodes 108b instead of employing the structure described with reference to FIGS. 1 to 3 in the counter electrodes 108b. A liquid crystal display was manufactured by the same method as that described in Example 1 except for the above.

[0153]Then, the display was driven by the same method as that described in Example 1 and its performance was evaluated. As a result, a response speed of 1 millisecond and a contrast ratio of 1000:1 were achieved.

example 3

[0154]In this example, employed was a design in which the circular polarizer including the quarter-wave plate 40F and the linearly polarizing plate 50F was a left-handed circular polarizer and the circular polarizer including the quarter-wave plate 40R and the linearly polarizing plate 50R was a right-handed circular polarizer. To be more specific, the directions of the transmission axes of the linearly polarizing plates 50F and 50R were rotated by 90° with respect to the directions of the transmission axes of the linearly polarizing plates 50F and 50R in the liquid crystal display manufactured in Example 1. A liquid crystal display was manufactured by the same method as that described in Example 1 except for the above.

[0155]Then, the display was driven by the same method as that described in Example 1 and its performance was evaluated. As a result, its contrast ratio was 100:1. In addition, the screen was seen bluish when displaying a black image.

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Abstract

A liquid crystal display includes a liquid crystal layer causing a selective reflection and exhibiting Kerr effect, first and second electrodes applying voltage to the liquid crystal layer, a first circular polarizer disposed between the liquid crystal layer and a viewer and allowing a first circularly polarized light incident on the liquid crystal layer when irradiated with a natural light, the first circularly polarized light having an electric-field vector rotating in a direction reverse to a rotation direction of an electric-field vector of a circularly polarized light selectively reflected by the liquid crystal layer, and a second circular polarizer facing the first circular polarizer with the liquid crystal layer interposed therebetween and allowing a second circularly polarized light incident on the liquid crystal layer when irradiated with a natural light.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2008-248323, filed Sep. 26, 2008, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a liquid crystal display technique.[0004]2. Description of the Related Art[0005]A liquid crystal display employing a particular display mode such as in-plane switching (IPS) mode, vertically aligned (VA) mode and optically compensated bend (OCB) mode can achieve high response speed. Even such a liquid crystal display, however, still has not achieved a response speed comparable to that of a cathode-ray tube (CRT) display.[0006]JP-A 2005-202390 (KOKAI) and JP-A 2008-112021 (KOKAI) describe a liquid crystal display utilizing Kerr effect. Kerr effect is the effect of a transparent isotropic medium to exhibit an anisotropic refractive index at...

Claims

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Application Information

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IPC IPC(8): G02F1/13357G02F1/1335
CPCG02F1/133528G02F2001/13793G02F2001/133541G02F1/13718G02F1/133541G02F1/13793
Inventor HASEGAWA, REIKIZU, YUKOYAMAGUCHI, HAJIME
Owner KK TOSHIBA
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